First of all I didnt see it as Mannat questioning her choices... she did the comparison fair enough... but it didnt look like that to me... maybe I am being ostrich again. 
The reason Mannat is so affected is because she loves Vik so much and he is behaving completely opposite to the person she fell in love with.
Even the audience is feeling the same isn't it?
That doesn't mean it will go Rishta way... no offense to the actor but Manit is not lead material. He is no competition to Adnan however good his acting is. And I doubt Mukta /Jassi dont know this... thats why they are doing so little of ManVik in post leap. Even those few moments are keeping them afloat.
Lets see what Mumbai brings.
I was vehemently opposing the idea that DK had dubious motives and I still haven't wrapped my head around the flip.
Why couldn't they keep is platonic is beyond me 🤦♀️
And like you said Even I am not sure what are they planning to do with this??? Naively I think it will be related to Dua and not Mannat.
Mannat is not over Vik... she doesnt even know what DK feels. Her words of praising him actually sound weird since she is unaware.
But as I have said many times... Mannats words and feelings are with the info the character knows... audience doesnt.
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